Device for dental use



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45,299 F. J. HOFSpHNEIDER V DEVICE FOR DENTAL USE Filed June 15 1922 h INVENTOR.

fieozerc'a Jfifi'scjwipkr A TTORNEY Patented Aug. 28, 1923.

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i'anvron non nnnrAn-usir Application filed June 13,

Devices for-Dental Use, of which the fol- I lowing is a specification. 7

My invention relates to a device for dental use, and more particularly'has for its purpose to afford a structure useful in conjunction'with a dental engine for furnishingga continuous supply of fluid, either water or air, together with electrical means for readily and quickly opening or shutting olf the fluid supply. I

In a more specific aspect, the invention has for one 'of its purposes to maintain a continuous supply of water to a grinding wheel or other abrasive element used on a dental engins hand piece, and 'to-automatically start the water supply upon closing the circuit to the motor which operates the engine, while cutting off the water supply as the motor is stopp d, Y Y: I v.

The invention also embraces certain other detailed features, all of which will appear clearly from the following description, when read in conjunctionwith the accompanying drawing, the novel features being pointed out in the claims following the specification.

' In the drawing; f 1 I V [Figure 1 is a view inelevation, partially brokenaway, showing-a preferred embodimentof the invention and-its application to a conventional style of dental hand piece;

Figure 2 is a verticalsectional view of the electrical valve controlling device and part of the fluid conducting means;

Figure 3 is a detail sectional view of the valve and valve seat, and l Figure 1 is a diagrammatic view of the electric circuit governing the parts. i

For the purpose of illustrating the invention, I have disclosed a preferred application in which water is supplied and acts to continuously maintain an abrasive element in a cool state while grinding, but my invention is not necessarily limited to the feeding of water or to the particular structure herein set forth, which is intended merely by way of example-of different possible adaptations.

In the drawing, 1 designates a conventional type of dental engine hand piece, and 2 1922. Serial No. 568,055.

isa metal tube provided with spring clips? by which it is detachablypositionable on the hand piece 1, with'itsouter or dischargeiend located adjacent-to the inner surfaceof the grindingwheel 4t. The metal tube 2 forms part of the fluid conducting means, and to this end has its'inner'end bent outwardly to receive a fiexibleiorrubber-tube 5, the opposite end of said flexibletube being connected to'an outlet 6 of the, electrical valveicontrolling device whichwill now; be'described;

Said electrical device comprises an electromagnet consisting of an outer c'oi1'7, .acore 8, and a vertically movable element in the form of a plunger?) which'is arranged within a housing 10. The .lower end of said housing 10 is closed by a removable,-thrcadedcap 11 which carries the aforementioned wateroutlet 6,:and connectingwith the upper end-of the housing 10 is a tube 12 which leads upwardlythrough the core 8 to receive a vertical .rod 13 that carrles the plunger'9 and extends upwardlyto a point above the top :of the electro-magnet. 7 1 1 designates a valve seat arranged at the upper end of the tube 12, above the top of the electro-magnet, and 15.is the fluid controlling valve carried at the upper endof said rod 13 and cooperating with the valve seat 14:. The valve 15 is preferably held in place onthe rod 13 by a nut or other suitable removable device, whichwhen taken off, permitsthe rod 13 and plunger 9to be dropped downwardly, after first removing the 3 cap 11', whcnrepairs-are required.

16- des'lgnates a coupling betweenythe'gup-,

perend of the tube 12 and'a' metaltube 17 c connecting witha'watersupply pipe 18. 1'9 1 V designates a manual cutofl:valvc, and 20 is a housing within which a; st aine-rn ay be located. 21 is aclean-out plug for the coupling 16, and 22 is an adjustable needle valve for regulating theinormal flow of water. The electrical device just described is intended to be mounted upon a wall, or at anyother suitable point, and is provided with binding posts 23 by which connection is made to the motor circuit, while the flexile tube 5 leads from. the outlets on the electrical device tothe dental engine hand piece. V v V I Referring to Figure 4, 241 designates the motor for the dental engine, 25 designates the motor circuit, 26 the panel board through which connection is made to the electro-magnet already referred to, and 27 is a hand switch for disconnecting the electrical valve controlling device when desired.

28 is the usual foot controlling switch for the motor circuit.

The operation of'the device briefly is as follows: In the position of the parts illustrated in Figure 2, the valve is closed by reason of the motor circuit being open,

and the plunger 9 has fallen by gravity until the valve rests upon its seat. Upon closing the motor circuit to start the engine, the core 8' is energized and the plunger 9 thereby elevated, lifting the valve 15 off fromits seat and permittingwater to pass through the tube 12 into the chamber 10,

' thence through 1 the tubes 5 and 2 into conthe usual city-water supply under pressure.

Thus, the, grinding element is always main-- tained in-a wet state, While the engine is in operation, and immediately the engine motor circui-tiis opened, the core 8 is deen ergized and the movable element 9 drops to its lowermost position and closes the valve. 7

While I have described the invention with 1 reference to a more or less particular embodiment, it is not limited to the details. set forth, but may be modified in various Ways without departing from the underlying features thereof or the scope of the follouu ing claims.

I claim: r i 1. A device for use with a dental, eng ne compr sing fluid conducting means, an electric motor foroperating said engine, a valve governing the passage of fluid through said conducting means, and an electrical device in the circuit with'said motor and operating automatically to open the valve when the motor is running and" to release the valve when the motor is idle.

2. The combination with a dental engine hand piece, of fluid conducting means including a tube that is detachably positioning means, an electric motor for the engine,

and an electrical. device automatically governed by said motor and operating to open the valve when the motoris running and to release the valve when the motor is idle.

4. The combination with a dental engine hand piece, of fluid conducting means including a' tube that is detachably position able on said hand'piece, an electric motor for the engine, an electrical device governed by said motor and comprising an electro-magnet having a vertically operating movable element, said fluid conducting means also including a tube extending through the center of said electro-inagnet, and a valve carried'by said vertically movable element andcontrollingfthe passage of fluid therethrough. e

5. The combination with a dental engine hand piece, of fluid conducting means including a tube that is detachably position able on said handpiece, an electric motor for the engine, an electrical device governed by said motor and comprising an electro-magnet having a vertically operating movable element, said fluid conducting means also extending through the center of said electro-magnet, a rod carried by said 'movable element and. extending upwardly FREDERIC J. norson EinER; 

